Tenant excuses, how far do you go to find the truth?

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I have had tenants tell me all manner of stories to explain why they were late with the rent. 

Sometimes, my empathetic side comes forward and gives them a free pass. I know that I must surely have been hoodwinked before with a false tale. How far should a landlord go to find the truth? Should we care, or should we just issue the notice?

What do you think Biggerpockets members?